CREATE TABLE flocks (
    id BIGSERIAL PRIMARY KEY,
    name VARCHAR NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ,
    created_by BIGINT REFERENCES users (id) ON DELETE SET NULL ON UPDATE CASCADE
);

CREATE UNIQUE INDEX flocks_name_unique ON flocks (name)
WHERE
    deleted_at IS NULL;

CREATE TABLE project_flocks (
    id BIGSERIAL PRIMARY KEY,
    flock_id BIGINT NOT NULL REFERENCES flocks (id) ON DELETE RESTRICT ON UPDATE CASCADE,
    area_id BIGINT NOT NULL REFERENCES areas (id) ON DELETE RESTRICT ON UPDATE CASCADE,
    product_category_id BIGINT NOT NULL REFERENCES product_categories (id) ON DELETE RESTRICT ON UPDATE CASCADE,
    fcr_id BIGINT NOT NULL REFERENCES fcrs (id) ON DELETE RESTRICT ON UPDATE CASCADE,
    location_id BIGINT NOT NULL REFERENCES locations (id) ON DELETE RESTRICT ON UPDATE CASCADE,
    period INT NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW(),
    updated_at TIMESTAMPTZ DEFAULT NOW(),
    deleted_at TIMESTAMPTZ,
    created_by BIGINT REFERENCES users (id) ON DELETE SET NULL ON UPDATE CASCADE
);

ALTER TABLE kandangs
    ADD COLUMN project_flock_id BIGINT REFERENCES project_flocks (id) ON DELETE SET NULL ON UPDATE CASCADE;